Pump



G. LARSEN.

July 24, 1934.

PUMP

Filed March 24, 1933 2 Sheets-Sheet l IN ENTOR- l ll l l l l /l 1 l l l l l /f G. LARSEN July 24, 1934.

PUMP

Filed March 24, 1933 2 Sheets-Sheet 2 TTORNE INVENTOR Patented .any 24, 1934 1,967,580

narran srnrss PATENT OFFICE PUMP Gabriel Larsen, Springeld, N.v J., assignor to L. E. Waterman Company, New York, N. Y., a corporation of New York Application Maren 24, 1933,1`Seria1 No. 662,423

15 Claims. (Cl. 1Z0- 47) This invention relates to a novel and improved ton is shown as provided with a centrally dis-A forrn of pump, the novel features of which Will posedY hole therethrough in which is received a be best understood from the following description piston rod 1) having thereon a flange 11 beneath and the annexed drawings, in which I have the piston and a shoulder 12 above the piston, shown a selected embodiment of the invention the nange and shoulder being spaced apart a 60 and in which: distance greater than the thickness or height Figl isaview, partly in elevation and partly in of the piston, as is plainly shown and for a section, of a fountain pen having my invention purpose which will appear presently. applied thereto; Beneath the flange 11, the piston rod is pro- Fig. 2 is a vertical sectional view through the vided with a squared end 13 slidably mounted in a 65 upper part of a fountain pen barrel and the pump correspondingly shaped socket 14 in a valve body applied thereto, and showing the parts in their which is threaded into engagement with the normal position when the pump is inoperative; body 5, as indicated at 16. The valve body has Fig. 3 is a View on the same plane as Fig. 2 thereon avalve proper, here shown as comprising 15 but showing the parts just before they become a flange 17 having a cup-shaped recess 18 adapted 70 operative as a pump; l to contact with the seat 19 on the bottom Aof the Figs. 4 and 5 are views similar to Fig. 3 but body 5. The valve body is provided with a plushowing the vparts when they are operating as rality of vertically extending air vents 20, each a pump, Fig. 5 being a section on the line 5--5 vent having the upper end 21 communicating of Fig. 6; with the chamber 8 at all times, and the lower 75 Fig. 6 is a section on the line 6-6 of Fig. 5; end 22 being disposed above the valve 17 and Fig. 7 is a fragmentary view of a part ofthe sometimes being open as,.for example, in Fig. 4, structure shown in Figs. 2, 3, 4, and 5, but taken and at other times being closed as in Fig. 2. The at right angles to the planes of those figures. opening 0f the Vents is Caused by movement 0f The invention may be used with various dethe valve proper away from its seat, and they are 80 vices, but is particularly adapted for use with closed by movement oi the valve proper into enfountainV pens and, for the sake of convenience, gagement with its seat, and this movement in I shall describe it when used with a fountain pen. turn is caused by rotation of the valve by means Solely for the purpose of convenience, I also shall presently to be described. assume that the barrel of the pen is extending The upper end 0f the Dump bOdY iS DlOVide- 85 vertically, and shall refer to the relative positions with a bore or recess 23 separated from the Chamof the parts as if the pen were in a vertical posiber 8 by a hOriZOntally @Xtending paTtitOn 24, tion, this partition having therethrough a hole 25 Referring now to the drawings, the numeral through which the piston rod 10 may Slide` AS 3. 1 designates the barrel of a fountain pen which silOWn in Figs. i and 5, this DaTOn Serves asp@ is tubular in form and is adapted to contain ink, a StOp to limit the upward movement of the DiS- as indicated at 2. Secured to the upper end of Jn 9. Threaded in'GO the upper end 0f the bore the barrel is a pump which may be used for draw- 23 is 21 'DU-biliar pill-g 26 Which lsCeVes the upperv ing ink into the barrel through the feed 3 disend 0f ihs PisiOn IOd- This @11d is surrounded by 4 posed beneath the Writing peint 4, The feed a sleeve 27 within which is disposed a compres- 95 may be of any usual type of construction, and siOn Spring 23 bearing ai? its lOWeI end against therefore its details are not illustrated, as they the DalitOn 24 and at its upper end against a may take various forms, all well known in the Cap 29, here ShOWn as secured t0 the upper end ari-, of the piston rod by means of a pin 30, this con- The body 5 oi the pump is threaded into enstruction being one which permits ready assem- 100 gegemenf, with the upper end of J@he barrel, as bling and disassembling of the various parts.

shown at 6, and in this embodiment the upper The Can s shOWn as having the Same external end of the barrel wall is thinner than the lower diameter and Contour as the body 5 0f the Dump portion thereof, thereby forming a shelf v7 for ef so as to. form a substantial continuation thereof purpose which will be explained later. when the pump is not being operated. The inv The body 0f the pump is provided with a, chamtellOl Of the Cap S provided With threads 31 t0 ber 8 containing a piston 9. In the form shown, engage the threads on the exterior of the plug 26.

the piston is cylindrical in cross-section, as is Extending lengthwise of the piston rod is a also the chamber 8, although these forms may, groove or rather a series of grooves communiof course, be varied as found expedient. The piseating with each other, these grooves being des, 1 10n cured together by a pin 35. This is a convenient manufacturing arrangement which also provides the shoulder 12, although, of course, other cone' venient forms may be employed.

In operation, when it is desired to pump ink into the barrel 1, the cap 29 is unscrewed from` the position in which it appears in Fig; 2.' It: will be noted that the threads on the plug 26 arel right-hand threads', whereas those on the valve body are left-hand. It will also be notedL that in Fig. 2, the valve proper 17 is in engagementwith its seat 19 when the cap 29 is in engagement withthe end 36 of the pump body. Now, as the c'a'p'29 is turned to' move it upwardly away from' the purnpbody, the piston rod which is secured to the cap' will, through its squared lower endA 13, turn the valve so that the valve proper leaves its seat.

When the capf is entirely disengaged from the plug 26, it maybe moved up and down, thereby operating the piston and pumping ink into the barrel'of the pen through the feed. In the uppermost position of the piston, it engages the partition 24;4 as seen in Figs'. 4 and 5, Fig. 4 showing the end' of the 11p-stroke of the rod. As the downstroke starts, the shoulder 12, as best shown in'lFigf. 5, will' engage the piston `and move it downwardly, and when in this position it will be seen that the airvent or air passage formed by the successive grooves 32, 33, and 34 is continuous from the chamber 8 to the atmosphere, `as the :groove 34- is exposed between the cap and the end" 36. Then, as the down-stroke of the rod andwpiston takes place,-. air may escape freely from the chamber.V The up-'stroke of the piston iscaused by engagement of the flange 11 with the lpiston, as shown in Fig. 3', and there it will be seen that the lower end of the groove 32 is covered by the piston Vand therefore the chamber 8 is' shut off from the atmosphere, and a suction therein is created.

When the pumping action is completed, the parts .are returned to the position shown in Fig. 2, and it will be seen that this is done by reengagi'ng the cap 29 with the threads on the plug 26'. The plug 26 is fixed in position in they body 5 of the pump, and in order that, when the cap 29 engagesthe end 36 of the pump body the valve proper 17 shall also engage its seat 19, it isvessential that the turning of the valve body should be simultaneous with the turning of the /cap' in engagement with the threads of the cap.

For example, if the cap were turned several times in vain efforts to catch the threads of the plug, the valvewouldrbe seated while the cap was still outl of, engagement with the end of the pump body, because it will be seen thaty the valve body is never out of engagement with the threads 16, and therefore any turning of the piston rod means a turning of. the valve body. Similarly, if

for any reason the threads on the cap should 4out of engagement with its seat 19. That wouldY mean that ink could work its way through, past the valve and into the pump.

The above difficulty is prevented by means which will insure that the pumping action must always take place with the piston rod in a certain denite rotative position, that it cannot rotate except when the cap is in engagement with theV plug, vand thatA this threaded engagement shall alwaysbegin at the proper time so that, when the cap engages the end 36 of the pump body, the valve proper 17 will firmly engage its seat 19. This means will now be described.

The interior of the plug 26 is provided with a groove 37 within which is adapted to be received a lug 38- protruding from the sleeve 27. This groove 37 isso arranged that the lug 38 will enter it at the exact instant that the cap 29A becomes disengagedfrom the threads of the plug 26. This action will probably be best understood from a study of Fig. 3, where it will be seen that the cap 29 isabout to become disengaged from the threads of the plug, the cap andA consequently the piston rod being turned in the direction indicated by the arrow 39. The lower end of the plug has a portion thereof cut away as indicated at 40 so as to provide an abrupt shoulder 41 against which the lug 33 may engage as the rotation of the cap and consequently the piston rod continues from the position shown in Fig. 3. This shoulder 41 is inline with one wall of the groove 37 so that, as the lug 38 strikes the shoulder, it is in position wherein it may be moved into the groove 37.

The pumping action'may now proceed, and after ie pumping is completed, the cap is again brought into threaded engagement with the plug 26 and rotated to bring the valve against its seat, and the cap into engagement with the end of the Vpump body. Because of the lug 38, the piston rod cannot be turned, it being noted that this lug is always within the groove 37 during the pumping action. The shoulder 41 is in fact the lower end of the thread on the plug. It is made anA abrupty end rather than a gradual tapering end as is 'common in threaded constructions, so that,

while the lug may pass freely beneath the last threadV on the turn previous to that indicated in Fig; 3, nevertheless when that turn takes place, the lug will engage the abrupt lower end. of the thread.

It will beseen that the arrangement just described also prevents turning of the piston rod to too great an extent, an extent which would causeY the valve body to become disengaged from the threads 16. Asa further precaution against this happening, the shoulder 7 is provided which.; would engage the ange 17 before the threads would become disengaged.

Various parts may be made of any suitable material, the piston here being indicated as made of rubber and working in a metallic sleeve with- 1, and for that purpose I have shown the barrel as being made of glass and thus transparent soA that L the level of ink may be observed. This, of course, performsthe double function of permitting the user to see when the barrel has become filled so he may stop' pumping, and also of permitting him` to see when the barrel isi nearly empty. Other suitable means ffor gauging the amount of ink' or otheruid may be used.

The invention is one which is found to be particularly useful in connection with fountain pens,

and it has been shown and described as so used, 5

although it is contemplated that other uses may be found therefor. It will be seen that all operating partsof the pump are in a position where none of them need come in contact with the ink or other fluid, thus preventing clogging of the pump mechanism.

While I have shown the invention as embodied in a specific form, it is to be understood that various `changes in details may be made without departing from the scope of the invention, and I therefore do not intend to limit myself except by the appended claims.

I claim:

1. In a pump, a valve having a body and a valve proper, a seat for said valve proper, means for moving said valve proper into and out of engagement with said seat, means forming an air vent past the valve, said vent being closed when the valve proper is in engagement with its seat, a container for fluid on one side of the valve, and a suction producing means on the other side thereof. l

2. In combination, a container for iluid, a pump disposed above said container and having a chamber with a suction producing means therein,

means normally closing said chamber from communication with said container, normally inoperative means to operate said suction producing means, and means to render said operating means operative and to simultaneously connect said chamber with said container.

3. In combination, a container for iuid,a pump disposed above said container and having a chamber with a suction producing means therein, a valve normally closing said chamber from `communication with said container, normally inoperative means to operate said suction producing means, and means to render'said operating means operative and to simultaneously open said valve and connect said chamber with said container.

4. In combination, a pump having a body with a chamber therein, a piston slidable within said chamber, a piston rod slidable within said piston, means limiting the sliding movement of the rod within the piston, whereby a lost motion operating connection between the rod and piston is provided, and an air vent in the piston rod and opened and closed by the relative motion of the piston with respect to the piston rod on movement of the rod in opposite directions.

5. In combination, a container for iiuid, a pump having a body secured to said container and closing the same, a chamber within said body, a valve having threaded engagement with said body and seated thereon, a piston slidable in said chamber, a piston rod to operate said piston and adapted to turn said valve upon turning of the rod, a member secured to said rod exteriorly of said body and adapted to turn the rod, said member being threaded to the body, said last-named threads being opposite in pitch to the threads between the valve and the body, for the purpose set forth.

6. In combination, a container for fluid, a pump having a body secured to said container and closing the same, a chamber within said body, a valve having threaded engagement with said body and seated thereon, a piston slidable in said chamber, a piston rod to operate said piston and adapted to turn said valve upon turning of the rod, a member secured to said rod exteriorly of said body and adapted to turn the rod, said member being threaded to the body, said last-named threads being opposite in pitch to the threads between the valve and the body and becoming disengaged upon turning of the rod while the valve is still in threaded engagement with the body.

7. In combination, a container for fluid, a pump having abody secured to said container and closing the same, a chamber within said body, a valve having threaded engagement with said body and seated thereon, a piston slidable in said chamber, a piston rod to operate said piston and adapted to turn said valve upon turning of the rod, a member secured to said rod eXteriorly of said body and adapted to turn the rod, said member being threaded to the body, said lastnamed threads being opposite in pitch to the threads between the valve and the body and becoming disengaged upon turning of the rod while the valve is still in threaded engagement with the body, and means preventing further rotation of the rod after disengagement of said last-named threadsk while permitting movement of the rod lengthwise thereof to operate the piston.

8. In combination, a container for iluid, a pump f having a body secured to said container and closing the same, a chamber within said body, a valve having threaded engagement with said body and seated thereon, a piston slidable in said chamber, a piston rod to operateV said piston and adapted to turn said valve upon turning of the rod, a member secured to said rod exteriorly of said body and adapted to turn the rod, said member being threaded to the body, said last-named threads being opposite in pitch to the threads between the valve and the body and becoming disengaged upon turning of the rod While the valve isstill in threaded engagement with the body, means preventing further rotation of the rod after disengagement of said lastnamed threads while permitting movement of the rod lengthwise thereof to operate the piston, said means comprising a lug connected to said rod and movable in a groove xed in position and extending longitudinally of the body, and means causing said lug to enter said groove when said last-named threads are disengaged.

9. In a pump, a body having a chamber with a piston movable therein, a piston rod adapted to operate said piston, a valve normally closing said chamber, a connection between said rod and Valve and adapted to open the valve upon turning of the rod, and means to limit the turning of said rod.

10. In a pump, a body having a chamber with a piston movable therein, a piston rod adapted to operate said piston, a valve normally closing said chamber, a connection between said rod and valve adapted to open the valve upon turning of the rod, and means to limit the turning of saidv rod in both directions.

11. In a pump, a body having a chamber with a piston movable therein, a piston rod adapted to operate said piston, a valve normally closing said chamber and having threaded engagement with said body, a valve proper on said valve and having engagement with a seat on said body, means forming air vents through the valve and termi nating at one end between said seat and valve proper and at the other end communicating with said chamber, means to turn said rod and having threaded connection with said body, and means to limit rotation of said rod Vto prevent disengagement of the threaded valve from the body.

12.l In a pump, a body having a chamber with a piston movable therein, a piston rod adapted to operate said piston, a Valve normally closing said chamber and having threaded engagement with said body, a Valve proper on said Valve and having engagement with a seat on said body, means forming air vents through the valve and terminating at one end between said seat and valve proper and at the other end communicating with said chamber, means to turn said rod and having threaded connection with said body, the extent of said threaded connection being less than the extent of the threaded engagement between the valve and the body, whereby said connection will be broken while said threaded engagement will remain.

13. In a pump, a body having a chamber with a piston movable therein, a piston rod adapted to operate said piston, a. valve normally closing said chamber and having threaded engagement with said body, a valve proper on said valve and having engagement with a seat on said body, means forming air vents through the valve and terminating at one end between said seat and valve proper and at the other end communicating with said chamber, means to turn said rod and having threaded connection with said body, the extent of said threaded connection being less than the extent of the threaded engagement between the valve and the body, whereby said connection will be broken while said threaded engagement will remain, and means preventing further rotatable 'movement of the rod after said threaded connection is ended.

14. In a pump, a body having a chamber with a piston slidable therein, a piston rod adapted to operate said piston and slidably mounted in said body, a Valve adapted to close said chamber and having threaded engagement with said body, a

connection between said piston rod andsad valve adapted to rotate the valve upon rotation of the rod, a bore within said body through which said rod passes, a tubular plug threaded into said bore andv surrounding said rod, said plug extending beyond the end of said body, a cap -securedto said rod and having threaded engagement with said plug, a lug connected to said rod and normally disposed in the'bore beneath said plug, said. plug having a groove extending parallel to said rod .and adapted to receive said lug, and said lug reaching said groove simultaneously wththe disconnection of the cap from the plug whenvthe cap is turned thereon.

15. In a pump, a body having a chamber with a piston slidable therein, a piston rod adaptedV to 1 operate said piston and slidably mounted in said body, a valve adapted to close said chamber and having threaded engagement with said body, a connection between said piston rod and said valve adapted to rotate the valve upon rotation of the rod, a bore within said body through which said rod passes, a tubular plug threaded into said bore and surrounding said rod, said plug lextending beyond the end of said body, a cap secured to said rod and having threaded engagement with said plug, a lug connected to said rod and normally dis osed in the bore beneath said plug, said plug having a groove extending parallel to said rod and adapted to receive said lug, said lug reaching said groove simultaneously with the disconnection of the cap from the plug when the cap is turned thereon, and an abrupt shoulder on the plug to engage said lug and guide it into Ysaid groove. y

GABRIEL LARSEN. 

